Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with transitional graphical user interface showing a first image in a sequence, showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view showing a fifth image thereof;

FIG. 6 is a front view showing a sixth image thereof;

FIG. 7 is a front view showing a seventh image thereof;

FIG. 8 is a front view showing an eighth image thereof;

FIG. 9 is a front view showing a ninth image thereof;

FIG. 10 is a front view showing a tenth image thereof;

FIG. 11 is a front view showing an eleventh image thereof;

FIG. 12 is an enlarged view of the claimed portion in the lower left corner of FIG. 1;

FIG. 13 is an enlarged view of the claimed portion in the lower left corner of FIG. 2;

FIG. 14 is an enlarged view of the claimed portion in the lower left corner of FIG. 3;

FIG. 15 is an enlarged view of the claimed portion in the lower left corner of FIG. 4;

FIG. 16 is an enlarged view of the claimed portion in the lower left corner of FIG. 5;

FIG. 17 is an enlarged view of the claimed portion in the lower left corner of FIG. 6;

FIG. 18 is an enlarged view of the claimed portion in the lower left corner of FIG. 7;

FIG. 19 is an enlarged view of the claimed portion in the lower left corner of FIG. 8;

FIG. 20 is an enlarged view of the claimed portion in the lower left corner of FIG. 9;

FIG. 21 is an enlarged view of the claimed portion in the lower left corner of FIG. 10; and,

FIG. 22 is an enlarged view of the claimed portion in the lower left corner of FIG. 11.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-11.

The process or period in which one image transitions to another image forms no part of the claimed design.

The outermost perimeter illustrated by a pair of dashed broken lines represents the display screen or portion thereof and forms no part of the claimed design.

The grayscale shading in FIGS. 1-22 represents a contrast in appearance. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 